31520541331 has 8 divisors (see below), whose sum is σ = 32456645424. Its totient is φ = 30592404480.

The previous prime is 31520541257. The next prime is 31520541341. The reversal of 31520541331 is 13314502513.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31520541331 - 2¹⁵ = 31520508563 is a prime.

It is a super-2 number, since 2×31520541331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31520541331.

It is not an unprimeable number, because it can be changed into a prime (31520541341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1983781 + ... + 1999606.

It is an arithmetic number, because the mean of its divisors is an integer number (4057080678).

Almost surely, 2^31520541331 is an apocalyptic number.

31520541331 is a deficient number, since it is larger than the sum of its proper divisors (936104093).

31520541331 is a wasteful number, since it uses less digits than its factorization.

31520541331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983621.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 31520541331 in words is "thirty-one billion, five hundred twenty million, five hundred forty-one thousand, three hundred thirty-one".